Fix mlr3 issue with probabilistic classification

[mayer79]

Fixes #99

[codecov-commenter]

Codecov Report

Merging #100 (65614f3) into main (8718366) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main     #100   +/-   ##
=======================================
  Coverage   93.67%   93.67%           
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  Files           5        5           
  Lines         348      348           
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  Hits          326      326           
  Misses         22       22           

Files Changed	Coverage Δ
R/kernelshap.R	99.05% <ø> (ø)
R/utils.R	92.42% <ø> (ø)